Accumulated Other Comprehensive Income (Loss) ("AOCI") - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Jun. 28, 2019	Jun. 29, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 3,363	$ 3,278
Other comprehensive income (loss)	(63)	0
Amounts reclassified to earnings from AOCI	14
Ending balance	22,925	3,244
Foreign currency translation
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(106)	(99)
Other comprehensive income (loss)	(25)	0
Amounts reclassified to earnings from AOCI	0	0
Ending balance	(131)	(99)
Income taxes	2	2	$ 2	$ 2
Net unrealized (losses) gains on hedging derivatives
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(38)	(20)
Other comprehensive income (loss)	(38)	1
Amounts reclassified to earnings from AOCI	1	0
Ending balance	(75)	(19)
Income taxes	24	6	13	7
Unrecognized postretirement obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(563)	(83)
Other comprehensive income (loss)	0	(1)
Amounts reclassified to earnings from AOCI	13	0
Ending balance	(550)	(84)
Income taxes	183	30	$ 188	$ 30
Total AOCI
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(707)	(202)
Other comprehensive income (loss)	(63)	0
Amounts reclassified to earnings from AOCI	14	0
Ending balance	$ (756)	$ (202)